臭氧改性对活性炭表面性能的影响及在卷烟中的应用

Effects of ozone modification on surface properties of activated carbon and its application to cigarette filter

为了研究臭氧改性对活性炭表面性能的影响,开发适用于卷烟中的香精缓释材料,对臭氧改性前后活性炭的比表面积、孔隙结构、表面官能团、表面酸性基团含量等进行了测定,并以2-环戊烯酮为模型分子,考察了臭氧改性活性炭在卷烟中的应用情况。结果表明:(1)随着改性时间的延长,臭氧改性活性炭的比表面积和孔容增大,活性炭表面酸性基团含量增加。(2)臭氧改性活性炭的红外光谱图上碳氧键的吸收峰数量增加,改性后活性炭表面官能团的种类增加。(3)臭氧改性后活性炭对2-环戊烯酮的吸附位点种类增加,使其脱附活化能增大,吸附量增加。在卷烟抽吸过程中,臭氧改性活性炭使2-环戊烯酮的释放量升高,而对主流烟气常规化学成分释放量无明显影响。

The effects of ozone modification on the surface properties, including specific surface area, pore structure, surface function groups and surface acidic group content, of activated carbon （AC） were studied to develop a flavor containing, slow aroma-releasing filter components for cigarette. The effects of ozone-modified AC were investigated by using 2-cyclopentenone as a model molecule. The results showed that： 1） With the prolonged ozone modifying time, the specific surface area, pore volume and surface acidic group content of AC increased. 2） The number of adsorption peaks of chemical bonds between carbon and oxygen in IR spectrum of ozone-modified AC increased, and the type of surface function groups was also increased after modification. 3） After the ozone treatment, the type of adsorption sites of 2-cyclopentenone on AC increased, which increased the desorption activation energy and adsorption capacity. During machine-smoking of test cigarettes containing the treated AC, ozone modification resulted in the increased release of 2-cyclopentenone, while did not significantly affect the release of routine chemical components in mainstream cigarette smoke.